Solvent-free Knoevenagel reaction catalysed by reusable pyrrolidinium base protic ionic liquids (PyrrILs): synthesis of long-chain alkylidenes
作者:R. C. M. Alves Sobrinho、P. M. de Oliveira、C. R. Montes D'Oca、D. Russowsky、M. G. Montes D'Oca
DOI:10.1039/c6ra25595g
日期:——
pyrrolidinium ionicliquid (PyrrIL) catalysis system was developed and used in a Knoevenagelcondensation reaction of long-chain aldehydes with several 1,3-dicarbonyl compounds. The Knoevenagelcondensation promoted by the PyrrILs proceeded smoothly and cleanly in solvent-free conditions, yielding good quantities of the condensation products, long-chain alkylidenes. Moreover, this catalysis system was recyclable
A two step synthetic strategy for obtaining 2-alkenyl-1,3-dicarbonyl compounds from the corresponding 1,3-dicarbonyl compounds is reported. The method is based on a Knoevenagel condensation and a Michael addition using a high order organocuprate procedure, and proves to be of general value, Obtained compounds are useful starting materials for the synthesis of furan derivatives, (C) 2002 Elsevier Science Ltd. All rights reserved.